Tag: heterogenous mixture - colloidal solution and its properties

The colour of a colloidal solution depends upon the size of colloidal particles present in it. Larger particles absorb the light of longer wavelength and therefore, transmit light of shorter wavelength. For example, a silver having particles of size $150$ nm appears violet whereas, that having particles of size $60$ nm appears orange yellow.

The options (B) and (C) represent true properties of colloidal solutions.
(A) Colloidal solution show Tyndall effect. They scatter light and make path of light visible through dispersion.
(B) Colloidal solution show Brownian movement which is ceaseless, random motion (of disperse phase particles) in all directions over a large area.
(C) Colloidal solution are heterogeneous. They are two phase system, dispersed phase and dispersion medium. There  is a definite surface of separation between each particle of dispersed phase and the dispersion medium
(D) Size of the colloidal particle is between 1 nm and 1000 nm.

$\text{This effect is known as Tyndall effect.}$

Finely powered or colloidal catalyst particles having small surface area cannot be rich in free valencies. When the catalyst is finely powdered the surface area of the particle is small but total surface area is very large.

The statements $(A)$ and $(C)$ are true for colloidal solution.
These are heterogenous (two phase) systems that diffuses slowly through animal membrane (parchment).
These solutions do not settles by just gravity.
Colloidal solutions show Tyndall effect (the particles scatter the light).

Colloidal solution can pass through filter paper but cannot pass through animal or vegetable membranes. For example, starch, gelatin, silicic acid, proteins etc.

A liquid is found to scatter a beam of light (due to Tyndall effect) but leaves no residue when passed through the filter paper (as the size of the particles is smaller than the pores of the filter paper).
The liquid can be described as a colloidal sol.

When -vely charged colloid-like $As _2S _3$ sol is added to +vely charged $Fe(OH) _3$ sol in suitable amounts both the sols are precipitated simultaneously it is due to the fact that negatively charged particles of the arsenious sulphide sol take up positive ions, resulting neutralisation of the charge on the colloidal particles and hence lowering the stability of the sol and both precipitate simultaneously.

Paramagnetisn is the magnetic behaviour of the matter and not the property of matter. Remaining all are the properties of solutions.

The particle size of the colloidal particle in dispersed phase typically ranges from $1 \ nanometer$ to $ 1 \ micrometer$ or. ${10}^{-6}$ to ${10}^{-9}m$